How do people write 4.3GB data DVDs?
 

Please help me keep my New Year's resolution this year which is to make regular backups. So far it's proving hard to keep...

Used dar (and kdar), I created backup files that are to be burned onto data DVDs. However I can't seem to burn the data files.

k3b says "It is not possible to add files over 4Gb."

mkisofs says:

z@obelix:~$ mkisofs -r -o /tmp/vortex-z-disk1.iso /home/backup/vortex-z-2007-01-28.1.dar
INFO: UTF-8 character encoding detected by locale settings.
Assuming UTF-8 encoded filenames on source filesystem,
use -input-charset to override.
mkisofs: Value too large for defined data type. File /home/backup/vortex-z-2007-01-28.1.dar is too large - ignoring
Total translation table size: 0
Total rockridge attributes bytes: 169
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 21000
175 extents written (0 MB)
z@obelix:~$

Here is the filesize:

z@obelix:~$ ls -l /home/backup/vortex-z-2007-01-28.1.dar
-rw-r--r-- 1 z z 4613734400 2007-01-29 00:15 /home/backup/vortex-z-2007-01-28.1.dar

which was determined by kdar: from the drop-down menu in kdar I picked out data dvd and it then creates 4.3GB slices.

So how do people write 4.3GB data DVDs?

Platform: Ubuntu 6.06

Hi,

you can not create files on DVDs larger than 4 GByte! Split your archive or use tar multivolume feature!

PS: You should use growisofs instead of mkisofs

R

I believe you are going above the capacity of the DVD media. The file size on your file is 4613734400. Also if you look at the DVD wiki, it shows something about 4.38GiB capacity (gibibyte - not a typo)

http://en.wikipedia.org/wiki/DVD

Thanks for that Micro420. Had never heard of gibibytes before!

According to wikipedia a DVD+R can store 2295104 sectors of 2048 bytes which comes to 4700372992 bytes (http://http://en.wikipedia.org/wiki/DVD+R).

KDar (2.0.6) is selecting an archive size of 4613734400 for data DVDs. This is lower than the DVD's capacity. So it would seem that it's not a capacity issue unless the file system (UDF) has an overhead larger than the difference.

Does anyone know what the overhead for UDF is?

Reported a bug for Ubuntu's kdar 2.0.6:
https://launchpad.net/bugs/82519